Beryllium Copper Canted Coil Springs for Spring Energized Seals

Beryllium-Kupfer schräge Schraubenfedern are high-performance components combining the superior mechanical and electrical properties of beryllium copper (BeCu) with the unique design advantages of canted coil springs. Here’s a detailed overview:

1. Material Properties

Beryllium copper (e.g., C17200, C17500 alloys)

Beryllium copper (e.g., C17200, C17500 alloys) offers a rare combination of high strength (tensile strength: 1160–1380 MPa for C17200) and excellent conductivity (22–28% IACS for C17200)

This makes it ideal for applications requiring both structural integrity and reliable electrical performance. Key attributes include:

• Fatigue resistance: Withstands millions of cycles without degradation, critical for dynamic environments.
• Korrosionsbeständigkeit: Suitable for harsh conditions, including high humidity and chemicals.
• Non-sparking: Safe for explosive environments in industries like oil & gas.

2. Design Advantages

Canted coil springs feature angled, elliptical coils that provide multi-point contact and a near-constant force throughout their deflection range

This design offers:

• Superior EMI/RFI shielding: The spring’s geometry ensures consistent conductivity, making it effective in sensitive electronics and aerospace systems.
• Vibration resistance: Independent coil deflection compensates for misalignment, ensuring reliable performance in high-shock environments like automotive ADAS sensors.
• Space efficiency: Delivers high force in compact designs, critical for miniaturized medical devices and connectors.

3. Anwendungen

Common uses include:

• Elektronik: High-frequency connectors, relay contacts, and thermal management components requiring both conductivity and mechanical stability.
• Aerospace/Defense: Avionics shielding, missile guidance systems, and lightweight structural components.
• Medizinische Geräte: Implantable sensors, MRI equipment, and precision surgical tools due to biocompatibility and corrosion resistance.
• Industrial: Oilfield downhole tools, robotic actuators, and EMI-protected PLCs.

4. Manufacturing & Customization

Manufacturers like Wonder Copper and Bal Seal Engineering use cold coiling (for wires <8 mm) or hot coiling (for thicker wires), followed by age-hardening to optimize strength and elasticity

Customization options include:

• Plating: Gold, silver, or nickel for enhanced conductivity or corrosion protection.
• Load profiles: Adjusting wire diameter, coil angle, and spacing to achieve precise insertion/removal forces (e.g., 1 lb to 10,000+ lb).
• Geometries: Radial or axial configurations for specific mounting requirements.

5. Material Comparison

Compared to phosphor bronze, beryllium copper offers higher strength (1.5–2x greater tensile strength) and conductivity, making it suitable for high-power applications

However, phosphor bronze is more cost-effective and better suited for marine environments due to its superior saltwater resistance

6. Industry Standards & Compliance

Manufacturers adhere to standards like ASTM B197 (mechanical properties) and ASTM B159 (chemical composition) for beryllium copper alloys

Medical and aerospace applications often require additional certifications (e.g., ISO 13485, AS9100)

7. Supplier Insights

Leading suppliers like Handa specialize in custom canted coil springs, offering design support and rapid prototyping.

For example, Handa’s C17200 springs are used in high-voltage switchgear and medical devices.

In summary, beryllium copper canted coil springs are engineered for reliability in demanding environments, combining material excellence with innovative design. Whether for EMI shielding, electrical connectivity, or mechanical latching, their performance makes them a preferred choice across industries. For specific applications, consulting with manufacturers can ensure optimal material selection and design parameters.